Merge bleeding edge up to 9192 into the GC branch.

test/mjsunit/harmony/block-let-crankshaft.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Test that the illegal continue is thrown at parse time.
+// Flags: --harmony-block-scoping --allow-natives-syntax
+
+// Test that temporal dead zone semantics for function and block scoped
+// ket bindings are handled by the optimizing compiler.
+
+function f(x, b) {
+  let y = (b ? y : x) + 42;
+  return y;
+}
+
+function g(x, b) {
+  {
+    let y = (b ? y : x) + 42;
+    return y;
+  }
+}
+
+for (var i=0; i<10; i++) {
+  f(i, false);
+  g(i, false);
+}
+
+%OptimizeFunctionOnNextCall(f);
+%OptimizeFunctionOnNextCall(g);
 
 try {
-  function Crash() { continue;if (Crash) {
-    } } 
-  Crash();
-  assertTrue(false);
+  f(42, true);
 } catch (e) {
-  assertTrue(e instanceof SyntaxError);
-  assertTrue(/continue/.test(e.message));
+  assertInstanceof(e, ReferenceError);
 }
+
+try {
+  g(42, true);
+} catch (e) {
+  assertInstanceof(e, ReferenceError);
+}